@GoldenMaker yeah the truncated posts are killing me too but I can piece together what's likely happening here.
Parallel Orions feeding into a Fogstar with VE.Bus BMS V2 — classic current limiting...
Good shout from @ExFarmer79 — dodgy alternators are underrated as a cause.
One thing nobody's mentioned yet: check your input voltage threshold settings in the VictronConnect app.
@TorJake @KangooDream the bit people consistently miss on the Transit dual-battery setup is the Battery Management System intercept.
@HarbourHermit nailed the mounting point. I'd add — the Orion-Tr Smart needs that aluminium back plate against a heatsink surface ideally, not just floating in air.
Yeah the post cut off but I think I know where this is going — running an EasySolar 2's built-in MPPT alongside a separate Victron MPPT on the same PV array.
Short answer: don't parallel them on...
@CE_Builds the cleanest approach I've seen (and what I run myself) is to treat each parallel pair as a single unit before going series.
@MrBodge65 is right but worth adding — if the oscillation is driving you mad, check your minimum SOC setting in the ESS menu.
Pretty much a non-starter for UK use yeah. Even if you bodged something together, you'd be fighting the kit's whole design philosophy — protection circuits, neutral handling, everything's built...
Parallel 12V lithiums need a decent controller to keep them happy, tbh. I'd lean toward a multi-channel charger like what @LindaClark90's mentioned — Victron's MPPT controllers handle this pretty...
@LochLover's spot on about the DC breaker — that's usually the culprit. But if that's fine, check your AC input wiring to the unit itself.
Seen this crop up a fair bit post-3.70. Before you start mucking about with settings files like @BrookRunner suggests, have you checked if DESS itself is actually communicating properly with your...
Been there with the van heating nightmare. Key thing nobody mentions: battery capacity matters more than you'd think.
Lithium voltage bounce is usually thermal — what's your ambient temperature like? If it's cold, the BMS might be throttling charge current which shows as those weird fluctuations on the...
Running MSW here for non-critical stuff — works fine for tools and lights. But sensitive electronics hate it.
The router's the real killer for off-grid setups. Mine sits at about 12W idle, but spikes to 20W+ during downloads.